Heat exchanger



Sept. 29, 1936. R. A. SHARP 2,055,949

HEAT EXCHANGER Filed Feb. 28, 1935 2 Sheets-Sheet l @MkmkkvJf/mirdAj/wrp y 0m Q! Sept. 29, 1936.

R.A.SHARP HEAT EXCHANGER Filed Feb. 28, 1935 2 Sheets-Sheet 2 m mmflaw/"5A- 5/75/17 entirely, as shown at 23, or may be provided withports through which the space within the hollow partitions l8 and I9 iscommunicated with the boiler space containing the water so that thewater is free to enter the hollow partitions l8 and l 9 which thusbecome water legs. Obviously, the water level within the boiler must bemaintained higher than the partitions i8 and !9.

With the partitions l8 and I9 constructed in this manner so as toutilize the water contents of the boiler as a heat-insulating medium,the upper and lower chamber or compartments of the headers arepositively separated from each other without the need for refractorylinings on the partitions i8 and i9.

Connecting'the lower compartments I5 and ll of the headers l0 and II,respectively, is a main' or any other suitable medium may be introducedinto the fire tube 24. I

The opposite end of the fire tube 24 opens to the lower chamber l5 ofthe header III. In line with this end of the tube is a refractorybarrier 26 covering the end wall 6 against which the flame or otherheating medium projected through the tube 24 impinges. Directly beneaththe point of communication between the fire tube 24 and the lowerchamber I5 is a refractory barrier 21 and to one side thereof is anotherrefractory barrier 28. These barriers extend across the lower chamber l5of the header ill to divide the same into separated compartments 29and'30.

, A plurality of fire tubes 3| connects the lower chambers l5 and ll ofthe headers l9 and ll, respectively, beneath the partitions l8 and IS.The ends of these tubes are anchored in the partition walls 8 and 9 asis customary and open to the chambers l5 and I1. Some of these tubescommunicate with the compartment 29 and others communicate with thecompartment 39 at their ends secured to the partition wall 8.

Within the lower chamber I! of the other header H is a transversehorizontal partition 32 in line with the partition 21 which divides thechamber i1 intoan upper compartment 33 and a lower compartment 34.Through the provision of these baflles or partitions within the lowerchambers l5 and II, the heating medium is caused to flow back and forththrough the tubes 3 I so that the heating medium makes a plurality ofpasses back and forth, and while the structure shown provides for fourpasses, or may be termed a four pass boiler, an arrangement providingfor a greater or lesser n'umbenof passes as the size 5 of the unit maydictate can be employed.

'titlons l8 and I9 comprises a heat exchanger through which the materialto be heated is circulated. This heat exchanger is substantially likethe lower boilter section of the unit and comaoeaoee prises the upperchambers l4 and I5 of the headers ill and M, respectively, and a secondplurality of tubes 36 connecting these upper chambers.

An inlet port 31 leading to the chamber l4 and carried by the end wall 6provides for the entrance of the material to be heated and an outletport 38 leading from the chamber l6 and carried by the end wall Iprovidesfor its discharge.

' The chambers I4 and. I6 are provided respectively with transversepartitions 39 and 40 which divide the chambers l4 and [6 intocompartments and form bafiies to cause the material being heated to flowback and forth through the tubes 36, as will be readily apparent. v

From the description thus far, it will be apparent that this inventionprovides a combined steam boiler and heating unit capable of many uses,and while not limited to the heating of bituminous and similar heavyviscous. materials used in paving, to enable the pumping thereof fromtank cars into transport trucks, it is admirably suited to this purposeand in Figure 4 the use of the invention'in this manner isdiagrammatically iliustrated.

As here shown, the combined boiler and heat exchanger provides motivepower for operating a steam pump 4| by which the material being handledis pumped from a tank car 42 through the heat exchanger and either backinto the tank car or into a transport truck 43.

A steam line 44 connecting the steam jacket of the unit with the pump 4|provides for the operation of the pump, and a second steam line 45leading from the steam jacket of the unit to the inlet of the steamcoils in the tank car supplies steam to the coils. The outlet end of thecoils has a return line 48 connected therei to, in which a steam trap41- is interposed. A-

condensate return pump 48 also connected in the line 46 returns thecondensate to the boiler.

The pump 4! has its inlet connected with the tank car by a pipe line-49and its discharge port connected with the inlet 31- of the heatexchanger by'a pipe line 50. The outlet 38 of the heat exchanger isconnected by a line 5| with a three way valve 52. Also connected withthe three way-valve'52 is a line 53 leading to the transport truck, anda line 54 leading back to the tank car'42.

Hence, through control of the valve 52, the contents of the tank car maybe pumped into the transport truck after being passed through the heatexchanger or may be continuously circulated from the tank car throughthe heat exchanger and back into the tank car.

As noted hereinbefore, this is but one manner of using the invention andis described merely for purposes of illustration. Other uses andadaptations of the combined steam boiler and heat exchanger unit willsuggest themselves to those skilled in the art to which this inventionappertains.

What I claim as my invention is:

'1. A heat exchanger comprising an outer shell, walls closing the endsof the shell, partition walls spaced inwardly from the endwalls andcooperating therewith to define headers, a plurality of tubes connectedat their ends with the partition walls and communicating the headers,means to divide each headerinto separated chambers, said separatedchambers of the headers together with the tubes communicating the sameproviding for the circulation of a heating medium and a fluid to beheated, one of the tubes for the circulation of the heating medium beingof large within the shell and around the tubes forming a container for aheat transfer medium to facilitate the transmission of heat from theheating medium to the fluid to be heated.

2. A combined steam boiler and heat transfer unit comprising an outershell, a closed header at each end of the shell, a partition dividingeach header into separateiLchambers, a plurality of tubes connected eattheir ends with one of each eithetgwmchdmbers into which each header isdivided, said tubes and the chambers communicated thereby providingpassages through which a heating medium may be circulated, one of saidtubes for the circulation of the heating medium being larger in diameterthan the rest, a tubular extension forming substantially a continuationof said larger tube through one of the headers to provide an inlet forthe heating medium so that said larger tube forms an initial combustionchamber, a second plurality of tubes connected at their ends with theother chamber of each header, said second plurality of tubes togetherwith the header chambers which they communicate affording passagesthrough which a fluid to be heated may be circulated, and the spacewithin the shell not occupied by said tubes affording a container for aheat transfer medium to facilitate the transmission of heat from theheating medium to the fluid to be heated.

3. In a heat exchanger of the character described, an outer shell, ahollow header closing each end of the shell, said headers having outerand inner walls; a partition dividing each header into separatedchambers, a plurality oi fire tubes having their ends connected with theinner walls of the headers beneath the partitions in the headers tocommunicate the lower chambers thereof, one of. said fire tubes beinglarger in diameter than the rest and having an extension at one enddirectly through the adjacent hollow header so as to provide an inletinto which the heating medium may be directly injected and whereby saidlarger diameter tube forms an initial combustion chamber, bailles insaid lower chambers to direct a heating medium injected into saidflre'tubes back and forth through said fire tubes, an exhaust lowerchambers of one of the headers through which spent heating medium isexhausted, a second plurality of tubes having their ends connected withthe inner walls of the headers above the partitions in the headers tocommunicate the leading from one of said upper chambers thereof, bafllesin the upper chambers of the headers to direct the flow of fluid tobe-heated back and forth through said second set of tubes, an inletleading to the upper chamber of one of the headers to provide for theentrance of fluid to be heated, and an outlet from one of the upperchambers of one of the headers for the fluid to be heated, the spacewithin the outer shell not occupied by said tubes providing a containerfor water and a jacket for steam developed upon heating of the water.

4. A heat exchanger of the character described comprising an outershell, a hollow header closing each end of the shell, each header havingan inner wall and an outer wall, a hollow partition dividing each headerinto separated chambers, the inner walls of the headers being open tocommunicate the interior of the hollow partitions with the interior ofthe outer shell so that water contained within the outer shell is freeto enter the hollow partitions, a plurality of fire tubes having theirends connected with the inner walls of the headers beneath the hollowpartitions to cooperate with the lower chambers of the hollowheaders andprovide passages through which a heating medium may be circulated, and asecond plurality of tubes connected to the inner walls of the headersabove the hollow partitions to cooperate with the upper chambers thereofand provide means through which a fluid to be heated may be circulate 5.A combined steam boiler and heater for viscous materials comprising anouter shell, 9, hollow header at each end of the shell, each headerhaving an inner wall and an outer wall, a partltiondividing each headerinto separated chainbers, a plurality of flre tubes having their endsconnected with the inner walls of the headers at one side of thepartitions to cooperate with the header chambers at that side of saidpartitions to provide for the circulation of a heating medium, one ofsaid fire tubes being larger in diameter than the others, and the outerand inner walls of one of the headers having aligned openings ofsubstantially the same diameter as said larger tube, a tubular member ofrefractory material extending across said header in line with saidopenings to form substantially a continua tion of said larger tube andprovide an inlet leading thereto through which a heating medium may beinjected directly into said larger tube for circulation through saidfire tubes, and a second plurality of tubes connected to the inner wallsof the headers on the other sides of said partitions to cooperate withthe header chambers at that side of the partitions to provide for thecirculation of a fluid to be heated.

RICHARD A; SHARP.

